All

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 D03 Heterocyclic Compounds D006571 +
  D03.383 Heterocyclic Compounds, 1-Ring D006573 +
   D03.383.773 Pyrrolidines D011759 +
    D03.383.773.812 Pyrrolidinones D011760 +
     D03.383.773.812.718 Pyrrolidonecarboxylic Acid D011761 
 D12 Amino Acids, Peptides, and Proteins D000602 +
  D12.125 Amino Acids D000596 +
   D12.125.072 Amino Acids, Cyclic D000598 +
    D12.125.072.401 Imino Acids D007098 +
     D12.125.072.401.761 Pyrrolidonecarboxylic Acid D011761